How do you work out the LCM for 25 28 30?

Answer 1

3 x 5 = 15
2 x 2 x 5 = 20
Combine the factors, eliminating duplicates.
2 x 2 x 3 x 5 = 60, the LCM

Answer 2

2 x 2 x 3 = 12

3 x 5 = 15

2 x 2 x 7 = 28

2 x 2 x 3 x 5 x 7 = 420, the LCM

Answer 3

2 x 2 x 2 x 2 = 16

2 x 2 x 7 = 28

2 x 2 x 2 x 2 x 2 x 2 = 64

Combine the factors, eliminating duplicates.

26 x 7 = 448, the LCM

Answer 4

Factor them.

5 x 5 = 25

2 x 2 x 7 = 28

2 x 3 x 5 = 30

Select the highest amount of each factor.

2 x 2 x 3 x 5 x 5 x 7 = 2100, the LCM

Answer 5

420

Answer 6

180

Answer 7

168